A Maryland man who took his unresponsive 3-year-old son to the hospital earlier this year is now in custody on first-degree child-abuse and manslaughter charges, WUSA-9 reports.

Police believe that Thomas Everett Holland, 38, gave the child lethal amounts of cocaine, acetaminophen and codeine after autopsy and toxicology reports showed that the child could not have accidentally ingested that amount, the news station reports.

According to WUSA-9, the police were called to investigate the death of Holland's son at the United Medical Center in Washington, D.C., on Jan. 26. Holland was arrested May 15.